Drug allergy and autoimmune diseases

Area of Science:

• Immunology
• Dermatology
• Rheumatology

Background:

• Systemic autoimmune diseases (SADs) are linked to a high incidence of drug allergies.
• Specific SADs like systemic lupus erythematosus (SLE), Sjögren's syndrome (SS), and adult-onset Still's disease (AOSD) show significant rates of drug allergies (17.1-63%, 7-40.1%, 17.6-54% respectively).
• Antimicrobial and nonsteroidal anti-inflammatory drugs are common culprits.

Purpose of the Study:

• To clarify the relationship between drug eruptions and systemic autoimmune diseases.
• To investigate the challenges in diagnosing drug eruptions in patients with autoimmune conditions.
• To explore the potential role of shared pathological mechanisms in the development of drug eruptions within SADs.

Main Methods:

• Review of existing literature on drug allergies in SLE, SS, and AOSD.
• Analysis of reported cases of severe drug eruptions, such as Stevens-Johnson syndrome (SJS)/toxic epidermal necrolysis (TEN), in patients with autoimmune diseases.
• Examination of immunological and cellular pathways implicated in both SADs and drug hypersensitivity.

Main Results:

• Drug eruptions are common in patients with SLE, SS, and AOSD, but distinguishing them from disease-specific skin manifestations is challenging.
• Severe drug reactions like SJS/TEN have been associated with autoimmune diseases, with observations of SS-like symptoms post-SJS/TEN and high anti-SS-A antibody prevalence.
• SLE is a known risk factor for SJS/TEN, suggesting shared underlying pathological mechanisms.

Conclusions:

• The interplay between systemic autoimmune diseases and drug eruptions requires further detailed investigation.
• Shared immune dysregulation, including aberrant T-cell function and neutrophil extracellular traps, may contribute to drug hypersensitivity in SADs.
• Improved diagnostic strategies are needed to differentiate true drug eruptions from autoimmune-related skin conditions.